Step 1: Warm Milk - Heat the milk, unsalted butter, and granulated sugar in a saucepan over medium heat until melted. Remove and cool slightly.

Step 2: Make Dough - In a stand mixer, combine flour, yeast, and salt. Slowly add warm milk mixture and mashed banana. Mix until shaggy dough forms.

Step 3: Knead Dough - Knead the dough using a dough hook for 6-8 minutes, adding more flour if necessary until smooth and slightly sticky.

Step 4: First Rise - Transfer the dough to a greased bowl, cover, and let it rise in a warm area for 1 to 1.5 hours or until doubled.

Step 5: Roll Out Dough - Punch down the risen dough and roll it out to a 18x12 inch rectangle on a floured surface.

Step 6: Spread Filling - Spread softened butter over the dough, then sprinkle with brown sugar and cinnamon mixture, and add sliced bananas.

Step 7: Cut Rolls - Roll the dough tightly into a log and cut into 12 equal pieces.

Step 8: Second Rise - Arrange rolls in a greased baking dish, cover, and let rise for 45 minutes until puffy.

Step 9: Preheat Oven - Preheat oven to 350°F while the rolls rise.

Step 10: Bake Rolls - Pour heavy cream over the rolls and bake for 30-35 minutes until golden brown.

Step 11: Prepare Frosting - Beat together softened cream cheese and butter; gradually mix in powdered sugar and vanilla extract until fluffy.

Step 12: Frost Rolls - Spread cream cheese frosting over warm rolls.